EP3228504A1 - Automotive door trim fastener and molding method - Google Patents
Automotive door trim fastener and molding method Download PDFInfo
- Publication number
- EP3228504A1 EP3228504A1 EP17164681.3A EP17164681A EP3228504A1 EP 3228504 A1 EP3228504 A1 EP 3228504A1 EP 17164681 A EP17164681 A EP 17164681A EP 3228504 A1 EP3228504 A1 EP 3228504A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pin
- grommet
- head
- retention
- barrel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000465 moulding Methods 0.000 title claims abstract description 6
- 238000000034 method Methods 0.000 title claims description 4
- 230000014759 maintenance of location Effects 0.000 claims abstract description 77
- 238000003780 insertion Methods 0.000 claims abstract description 6
- 230000037431 insertion Effects 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 239000012778 molding material Substances 0.000 claims description 10
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 239000002991 molded plastic Substances 0.000 claims 1
- 239000002184 metal Substances 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/02—Internal Trim mouldings ; Internal Ledges; Wall liners for passenger compartments; Roof liners
- B60R13/0237—Side or rear panels
- B60R13/0243—Doors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/02—Internal Trim mouldings ; Internal Ledges; Wall liners for passenger compartments; Roof liners
- B60R13/0206—Arrangements of fasteners and clips specially adapted for attaching inner vehicle liners or mouldings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
- F16B19/04—Rivets; Spigots or the like fastened by riveting
- F16B19/08—Hollow rivets; Multi-part rivets
- F16B19/10—Hollow rivets; Multi-part rivets fastened by expanding mechanically
- F16B19/1027—Multi-part rivets
- F16B19/1036—Blind rivets
- F16B19/1081—Blind rivets fastened by a drive-pin
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B2/00—Friction-grip releasable fastenings
- F16B2/20—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening
- F16B2/22—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
- F16B5/06—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips
- F16B5/0607—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips joining sheets or plates to each other
- F16B5/0621—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips joining sheets or plates to each other in parallel relationship
- F16B5/065—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of clamps or clips joining sheets or plates to each other in parallel relationship the plates being one on top of the other and distanced from each other, e.g. by using protrusions to keep contact and distance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
- B29C2045/1601—Making multilayered or multicoloured articles the injected materials not being adhered or bonded to each other
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
- B29L2031/3005—Body finishings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/727—Fastening elements
Definitions
- the present disclosure relates to automotive door trim fasteners.
- Automotive door trim fasteners are typically one-piece fasteners, including a head that engages an interior doghouse opening of the door trim, and a shank with a retention feature that is received in a sheet metal aperture of the door.
- the shank typically includes retention features that directly engage against the sheet metal adjacent the aperture. Removal of the door trim from the sheet metal requires defeating the retention features, which destroys or reduces the fastener's ability to effectively couple the door trim to the sheet metal of the door; particularly after repeated removal of the door trim from the door.
- the fastener must be replaced when the retention force drops below that desired to effectively couple the door trim to the door.
- an automotive fastener for coupling a door trim panel to an interior door member can include a pin and a grommet.
- the grommet can include a grommet head, a barrel extending from the grommet head, and a central aperture extending axially through both the grommet head and the barrel.
- At least one retention wing can extend radially outwardly from the barrel and upwardly toward the grommet head.
- At least one barrel slot can separate a distal end of the barrel into at least one pin retention pawl.
- the pin retention pawl can include an inner retention tooth comprising a lead-in ramp surface facing toward the grommet head on an interior side of each pin retention pawl and a lead-out ramp surface distal of the lead-in ramp surface and facing away from the grommet head.
- the pin can include a pin head and a shaft extending axially from the pin head.
- the shaft can include a recess receiving the inner retention tooth, with a pin head facing surface positioned and designed to engage the lead-out surface and displace the pin retention pawl radially outwardly during removal of the shaft from the central aperture of the grommet.
- a distal facing outer surface can be positioned and designed to engage the lead-in surface and displace the pin retention pawl radially outwardly during insertion of the shaft into the central aperture of the grommet.
- an automotive fastener for coupling a door trim panel to an interior door member can include a pin and a grommet.
- the grommet can include a grommet head, a barrel extending from the grommet head, and a central aperture extending axially through both the grommet head and the barrel.
- a pair of retention wings can extend radially outwardly from the barrel and upwardly toward the grommet head. The retention wings can be designed to engage and retain a portion of the interior door member between the grommet head and the retention wings.
- a pair of longitudinally extending barrel slots can separate a distal end of the barrel into a pair of pin retention pawls.
- a barrel groove can provide a thinned wall portion of the barrel extending from an upper end of the barrel slot.
- Each pin retention pawl can include an inner retention tooth comprising a lead-in ramp surface facing toward the grommet head on an interior side of each pin retention pawl and a lead-out ramp surface distal of the lead-in ramp surface and facing away from the grommet head.
- the pin can include a pin head and a shaft extending axially from the pin head.
- the shaft can include at least one recess receiving the inner retention teeth without radially outwardly displacing the pin retention pawls.
- a pin head facing surface can be positioned and designed to engage the lead-out surfaces and displace the pin retention pawl radially outwardly during removal of the shaft from the central aperture of the grommet.
- a distal facing outer surface can be positioned and designed to engage the lead-in surfaces and displace the pin retention pawl radially outwardly during insertion of the shaft into the central aperture of the grommet.
- a method of manufacturing the automotive fastener for coupling a door trim panel to an interior door member can include injecting pin molding material into mold a pin mold cavity having a shape corresponding to the pin to mold the pin.
- the pin, molded in the pin mold cavity can be positioned within a grommet mold cavity having a shape corresponding to the grommet when the pin is positioned therein.
- a grommet molding material can be injected into the grommet mold cavity around the pin to mold the grommet.
- the grommet molding material can be different from the pin molding material and does not bond to the pin molding material when molding the grommet.
- one exemplary automotive door trim fastener 20 in accordance with the present disclosure includes a pin 22 and grommet 24.
- the grommet 24 includes a grommet head 26.
- the grommet head 26 includes a rigid annular head portion 28 and a thin-walled umbrella-shaped portion 30.
- a barrel 32 extends axially away from the grommet head 26 to a distal end.
- a central bore or aperture 34 extends axially through both the grommet head 26 and the barrel 32.
- a pair of retention wings 36 extend radially outwardly from the barrel 32 and upwardly toward the grommet head 26.
- the retention wings 36 are designed to engage a periphery of an aperture 38 of an interior door member 40 to retain the grommet 24 in the aperture 38 with the interior door member 40 between the grommet head 26 and the retention wings 36.
- the retention wings 36 position and retain an upper side or face of the door member 40 against a lower side of the grommet head 26 provided by the umbrella-shaped portion 30.
- each pin retention pawl 44 includes an inner retention tooth 46.
- the inner retention tooth 46 includes a lead-in ramp surface 48 facing toward the grommet head 26 on an interior side of each pin retention pawl 44 and a lead-out ramp surface 50 distal of the lead-in ramp surface 44 and facing away from the grommet head 26.
- the pin 22 includes a pin head 52 and a shaft 54 extending axially from the pin head 52 to a distal end.
- the pin shaft 54 includes a recess 56 positioned and designed to receive the inner retention tooth 46 of the grommet 24 such that the pin retention pawls 44 are not radially outwardly displaced.
- the shaft 54 of the pin 22 includes a distal facing outer surface 58 positioned and designed to engage the lead-in ramp surface 48 and displace the pin retention pawl 44 radially outwardly during insertion of the shaft 54 into the central aperture 34 of the grommet 24.
- An outer surface 60 of the shaft 54 facing toward the pin head 52 is positioned and designed to engage the lead-out surface 50 and displace the pin retention pawl 44 radially outwardly during removal of the shaft 54 from the central aperture 34 of the grommet 24.
- the barrel groove 62 provides a thinned wall portion of the barrel 32 that operates as a flex point.
- the material stress of the barrel 32 during displacement of the pin retention pawls is localized along the thin walled portion provided by the barrel groove 62. This makes the resulting impact of the material stress more predictable and repeatable.
- the angle of the lead-in surface 48 relative to the axis of the barrel 32 can be from about 130 degrees to about 50 degrees. In other cases, the angle of the lead-in surface 48 relative to the axis of the barrel 32 can be from about 115 degrees to about 65 degrees. In yet other cases, the angle of the lead-in surface 48 relative to the axis of the barrel 32 can be from about 100 degrees to about 80 degrees.
- the angle of the lead-out surface 50 relative to the axis of the barrel 32 can be from about 130 degrees to about 50 degrees. In other cases, the angle of the lead-out surface 50 relative to the axis of the barrel 32 can be from about 115 degrees to about 65 degrees. In yet other cases, the angle of the lead-out surface 50 relative to the axis of the barrel 32 can be from about 100 degrees to about 80 degrees.
- the depth of the barrel groove 62 can be from about 15 percent to about 70 percent of the adjacent thickness of the wall of the barrel 32. In some cases, the width of the barrel groove 62 can be from about 10 percent to about 35 percent of the adjacent diameter of the barrel 32.
- the door trim panel 64 can include an interior dog house with an opening 66, such as a slot or a keyway, through which the shaft 54 extends.
- the slot or keyway 66 of the door trim panel 64 allows a lower surface 70 of the pin head 52 to engage against an upper surface 68 of the door trim panel 64 without needing to remove the pin 22 from the grommet 24.
- the opposite, lower surface 72 of the interior door member 64 engages against an upper surface 74 of the head 26 of the grommet 24.
- the trim panel 64 With the fastener 20 coupled to the trim panel 64, the trim panel 64 is then positioned to locate the fastener 20 adjacent the aperture 38 of the interior door member 40, which can be made of sheet metal. Applying a force against the trim panel 64 pushes the grommet 24, mounted on the pin 22, into the aperture 38 of the interior door member 40 until the retention members 76 of the retention wings 36 engage and retain the periphery of the aperture 38 and the upper surface of the interior door member 40 engages a lower side of the umbrella portion 30 of the grommet head 26. Thus, the door trim panel 64 and the interior door member 40 are coupled together while the pin retention pawls 44 remain in their non-stressed, non-radially outwardly displaced position.
- the fastener 20 is coupled to both the door trim panel 64 and the interior door member 40 without the need to remove or insert the pin 22 into the grommet 24.
- the fastener 20 is manufactured with the pin 22 positioned inside the grommet 24 as illustrated in the drawings.
- the fastener 20 can be manufactured by molding the pin 22 of a first material in a pin mold cavity having a shape corresponding to the shape of the pin 22. Then, the pin 22 can be positioned within in a grommet mold cavity having a shape corresponding to a shape of the grommet 24 when the pin 22 is positioned within the grommet mold cavity.
- the grommet 24 can be molded of a second material that will not bond to the first material, so that the pin 22 and grommet 24 are separate components, even when molded using such a two-shot molding process.
- the fastener 20 needs to be replaced.
- FIG. 6-8 another exemplary automotive door trim fastener 20 in accordance with the present disclosure includes a pin 22 and grommet 24.
- this example is very similar in structure and function to the example described above, so the same reference numerals are used in these drawings to identify like features and the description will not be repeated below. Similarly, the description of the two-shot manufacturing process and the process of using the fastener will not be repeated below.
- the pin 22 of this example includes two pin heads 52, 78.
- the shaft portion 37 between the two pin heads 52, 78 is positioned to extend through the opening 66 of the door trim panel 64.
- the upper surface 68 of the door trim panel 64 engages against the lower surface 70 of the first pin head 52.
- the lower surface 72 of the door trim panel 64 engages against the upper surface 80 of the second pin head 78, instead of the grommet head 26.
- the grommet head 26 still includes the thin-walled umbrella-shaped portion 30, but does not include such a substantial rigid annular portion 28.
- the illustrated fasteners 20 both include pairs of retention wings 36, pairs of slots 42, pairs of grooves 62, pairs of retention pawls 44 and pairs of inner retention teeth 46. Any combination of these features may alternatively be singularly represented in the fastener 20, while any other combination may be represented in pairs in the same or another fastener 20, and/or any of the combination may be represented in another multiple number in the same or another the fastener 20.
- an alternative fastener 20 could include a single retention wing 36, three pawls 44, and only one of the pawls 44 including an inner retention tooth 46
- first, second, third, etc. may be used herein to distinguish various elements, components, and/or portions from each other, they are not used herein to imply any relative importance, sequence or order.
- spatially relative terms such as upper and lower, are used to describe various elements, components, and/or portions relative to each other when the fastener is oriented as shown in the drawing figures, they are not used herein to imply any particular required orientation of the fastener.
- the fastener may be otherwise oriented (rotated 90 degrees or at other orientations) and these spatially relative descriptors used herein interpreted accordingly.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
Abstract
Description
- The present disclosure relates to automotive door trim fasteners.
- This section provides background information related to the present disclosure which is not necessarily prior art.
- Automotive door trim fasteners are typically one-piece fasteners, including a head that engages an interior doghouse opening of the door trim, and a shank with a retention feature that is received in a sheet metal aperture of the door. The shank typically includes retention features that directly engage against the sheet metal adjacent the aperture. Removal of the door trim from the sheet metal requires defeating the retention features, which destroys or reduces the fastener's ability to effectively couple the door trim to the sheet metal of the door; particularly after repeated removal of the door trim from the door. Thus, the fastener must be replaced when the retention force drops below that desired to effectively couple the door trim to the door.
- It is desirable to provide an automotive door trim fastener that can permit the door trim to be repeatedly removed and replaced without replacing the fastener and while maintaining the desired retention force.
- This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.
- In accordance with an aspect of the present disclosure, an automotive fastener for coupling a door trim panel to an interior door member can include a pin and a grommet. The grommet can include a grommet head, a barrel extending from the grommet head, and a central aperture extending axially through both the grommet head and the barrel. At least one retention wing can extend radially outwardly from the barrel and upwardly toward the grommet head. At least one barrel slot can separate a distal end of the barrel into at least one pin retention pawl. The pin retention pawl can include an inner retention tooth comprising a lead-in ramp surface facing toward the grommet head on an interior side of each pin retention pawl and a lead-out ramp surface distal of the lead-in ramp surface and facing away from the grommet head. The pin can include a pin head and a shaft extending axially from the pin head. The shaft can include a recess receiving the inner retention tooth, with a pin head facing surface positioned and designed to engage the lead-out surface and displace the pin retention pawl radially outwardly during removal of the shaft from the central aperture of the grommet. A distal facing outer surface can be positioned and designed to engage the lead-in surface and displace the pin retention pawl radially outwardly during insertion of the shaft into the central aperture of the grommet.
- In accordance with another aspect of the present disclosure, an automotive fastener for coupling a door trim panel to an interior door member can include a pin and a grommet. The grommet can include a grommet head, a barrel extending from the grommet head, and a central aperture extending axially through both the grommet head and the barrel. A pair of retention wings can extend radially outwardly from the barrel and upwardly toward the grommet head. The retention wings can be designed to engage and retain a portion of the interior door member between the grommet head and the retention wings. A pair of longitudinally extending barrel slots can separate a distal end of the barrel into a pair of pin retention pawls. A barrel groove can provide a thinned wall portion of the barrel extending from an upper end of the barrel slot. Each pin retention pawl can include an inner retention tooth comprising a lead-in ramp surface facing toward the grommet head on an interior side of each pin retention pawl and a lead-out ramp surface distal of the lead-in ramp surface and facing away from the grommet head. The pin can include a pin head and a shaft extending axially from the pin head. The shaft can include at least one recess receiving the inner retention teeth without radially outwardly displacing the pin retention pawls. A pin head facing surface can be positioned and designed to engage the lead-out surfaces and displace the pin retention pawl radially outwardly during removal of the shaft from the central aperture of the grommet. A distal facing outer surface can be positioned and designed to engage the lead-in surfaces and displace the pin retention pawl radially outwardly during insertion of the shaft into the central aperture of the grommet.
- In accordance with yet another aspect of the present disclosure, a method of manufacturing the automotive fastener for coupling a door trim panel to an interior door member can include injecting pin molding material into mold a pin mold cavity having a shape corresponding to the pin to mold the pin. The pin, molded in the pin mold cavity, can be positioned within a grommet mold cavity having a shape corresponding to the grommet when the pin is positioned therein. A grommet molding material can be injected into the grommet mold cavity around the pin to mold the grommet. The grommet molding material can be different from the pin molding material and does not bond to the pin molding material when molding the grommet.
- Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
- The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.
-
Fig. 1 is a perspective view of one exemplary automotive door trim fastener in accordance with the present disclosure. -
Fig. 2 is a side elevation view of the exemplary automotive door trim fastener ofFig. 1 . -
Fig. 3 is a front elevation view of the exemplary automotive door trim fastener ofFig. 1 . -
Fig. 4 is a cross-sectional view taken through the barrel grooves of the exemplary automotive door trim fastener ofFig. 1 . -
Fig. 5 is a cross-sectional view taken through the retention wings of the exemplary automotive door trim fastener ofFig. 1 , and including the portions of the automotive panels being coupled thereby. -
Fig. 6 is a perspective view similar toFig. 1 of another exemplary automotive door trim fastener in accordance with the present disclosure. -
Fig. 7 is a cross-sectional view similar toFig. 4 of the exemplary automotive door trim fastener ofFig. 6 . -
Fig. 8 is a cross-sectional view similar toFig. 5 of the exemplary automotive door trim fastener ofFig. 6 . - Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.
- Example embodiments will now be described more fully with reference to the accompanying drawings.
- Referring to
Figs. 1-5 , one exemplary automotivedoor trim fastener 20 in accordance with the present disclosure includes apin 22 and grommet 24. Thegrommet 24 includes agrommet head 26. In the illustrated example, thegrommet head 26 includes a rigidannular head portion 28 and a thin-walled umbrella-shapedportion 30. Abarrel 32 extends axially away from thegrommet head 26 to a distal end. A central bore oraperture 34 extends axially through both thegrommet head 26 and thebarrel 32. - A pair of
retention wings 36 extend radially outwardly from thebarrel 32 and upwardly toward thegrommet head 26. Theretention wings 36 are designed to engage a periphery of anaperture 38 of aninterior door member 40 to retain thegrommet 24 in theaperture 38 with theinterior door member 40 between thegrommet head 26 and theretention wings 36. In the illustrated embodiment, theretention wings 36 position and retain an upper side or face of thedoor member 40 against a lower side of thegrommet head 26 provided by the umbrella-shapedportion 30. - A pair of longitudinally extending
barrel slots 42 separate a distal end of thebarrel 32 into a pair ofpin retention pawls 44. Abarrel groove 62 extends from an upper end of eachbarrel slot 42 providing a longitudinally extending thinned wall portion of thebarrel 32. In the illustrated example, eachpin retention pawl 44 includes aninner retention tooth 46. Theinner retention tooth 46 includes a lead-inramp surface 48 facing toward thegrommet head 26 on an interior side of eachpin retention pawl 44 and a lead-outramp surface 50 distal of the lead-inramp surface 44 and facing away from thegrommet head 26. - In the illustrated example, the
pin 22 includes apin head 52 and ashaft 54 extending axially from thepin head 52 to a distal end. Thepin shaft 54 includes arecess 56 positioned and designed to receive theinner retention tooth 46 of thegrommet 24 such that thepin retention pawls 44 are not radially outwardly displaced. Theshaft 54 of thepin 22 includes a distal facingouter surface 58 positioned and designed to engage the lead-inramp surface 48 and displace thepin retention pawl 44 radially outwardly during insertion of theshaft 54 into thecentral aperture 34 of thegrommet 24. Anouter surface 60 of theshaft 54 facing toward thepin head 52 is positioned and designed to engage the lead-outsurface 50 and displace thepin retention pawl 44 radially outwardly during removal of theshaft 54 from thecentral aperture 34 of thegrommet 24. - During displacement of the
pin retention pawls 44 radially outwardly, thebarrel groove 62 provides a thinned wall portion of thebarrel 32 that operates as a flex point. As a result, the material stress of thebarrel 32 during displacement of the pin retention pawls is localized along the thin walled portion provided by thebarrel groove 62. This makes the resulting impact of the material stress more predictable and repeatable. - In some cases, the angle of the lead-in
surface 48 relative to the axis of thebarrel 32 can be from about 130 degrees to about 50 degrees. In other cases, the angle of the lead-insurface 48 relative to the axis of thebarrel 32 can be from about 115 degrees to about 65 degrees. In yet other cases, the angle of the lead-insurface 48 relative to the axis of thebarrel 32 can be from about 100 degrees to about 80 degrees. - In some cases, the angle of the lead-
out surface 50 relative to the axis of thebarrel 32 can be from about 130 degrees to about 50 degrees. In other cases, the angle of the lead-out surface 50 relative to the axis of thebarrel 32 can be from about 115 degrees to about 65 degrees. In yet other cases, the angle of the lead-out surface 50 relative to the axis of thebarrel 32 can be from about 100 degrees to about 80 degrees. - In some cases, the depth of the
barrel groove 62 can be from about 15 percent to about 70 percent of the adjacent thickness of the wall of thebarrel 32. In some cases, the width of thebarrel groove 62 can be from about 10 percent to about 35 percent of the adjacent diameter of thebarrel 32. - Use of the illustrated
example fastener 20 ofFigs. 1-5 includes coupling thepin 22 to an automotive doortrim panel 64 via thepin head 52. For example, the doortrim panel 64 can include an interior dog house with anopening 66, such as a slot or a keyway, through which theshaft 54 extends. In some cases, the slot orkeyway 66 of the doortrim panel 64 allows alower surface 70 of thepin head 52 to engage against anupper surface 68 of the doortrim panel 64 without needing to remove thepin 22 from thegrommet 24. In this example, the opposite,lower surface 72 of theinterior door member 64 engages against anupper surface 74 of thehead 26 of thegrommet 24. - With the
fastener 20 coupled to thetrim panel 64, thetrim panel 64 is then positioned to locate thefastener 20 adjacent theaperture 38 of theinterior door member 40, which can be made of sheet metal. Applying a force against thetrim panel 64 pushes thegrommet 24, mounted on thepin 22, into theaperture 38 of theinterior door member 40 until theretention members 76 of theretention wings 36 engage and retain the periphery of theaperture 38 and the upper surface of theinterior door member 40 engages a lower side of theumbrella portion 30 of thegrommet head 26. Thus, the doortrim panel 64 and theinterior door member 40 are coupled together while thepin retention pawls 44 remain in their non-stressed, non-radially outwardly displaced position. - As stated above, in some cases, the
fastener 20 is coupled to both the doortrim panel 64 and theinterior door member 40 without the need to remove or insert thepin 22 into thegrommet 24. In some cases, thefastener 20 is manufactured with thepin 22 positioned inside thegrommet 24 as illustrated in the drawings. For example, thefastener 20 can be manufactured by molding thepin 22 of a first material in a pin mold cavity having a shape corresponding to the shape of thepin 22. Then, thepin 22 can be positioned within in a grommet mold cavity having a shape corresponding to a shape of thegrommet 24 when thepin 22 is positioned within the grommet mold cavity. Thegrommet 24 can be molded of a second material that will not bond to the first material, so that thepin 22 andgrommet 24 are separate components, even when molded using such a two-shot molding process. - As should be apparent from the above, there is no need to insert the
pin 22 into thegrommet 24, displacing thepin retention pawls 44 radially outwardly, prior to fastening the doortrim panel 64 to theinterior door member 40 using thefastener 20. Such a reduction in the number of times or cycles thepin retention pawls 44 are radially outwardly displaced as a result of thepin 22 engaging theinterior tooth 46 is advantageous. Specifically, each cycle or time thepin retention pawls 44 are radially outwardly displaced material stress on thegrommet 24 reduces the retention force, or the force necessary to remove thepin 22 from thegrommet 24 to some extent. After a number of cycles, this retention force will be reduced beyond a desired minimum force coupling force. At such a time, thefastener 20 needs to be replaced. When the first cycle occurs upon the first time doortrim panel 64 needs to be removed from theinterior door member 40, this means the number of times the doortrim panel 64 can be removed and replaced before there is a need to replace thefastener 20 is increased. - Referring to
Figs. 6-8 , another exemplary automotive doortrim fastener 20 in accordance with the present disclosure includes apin 22 andgrommet 24. In large part, this example is very similar in structure and function to the example described above, so the same reference numerals are used in these drawings to identify like features and the description will not be repeated below. Similarly, the description of the two-shot manufacturing process and the process of using the fastener will not be repeated below. - Unlike the first example, the
pin 22 of this example includes two pin heads 52, 78. Theshaft portion 37 between the two pin heads 52, 78 is positioned to extend through theopening 66 of the doortrim panel 64. Theupper surface 68 of the doortrim panel 64 engages against thelower surface 70 of thefirst pin head 52. Thelower surface 72 of the doortrim panel 64 engages against theupper surface 80 of thesecond pin head 78, instead of thegrommet head 26. Thegrommet head 26 still includes the thin-walled umbrella-shapedportion 30, but does not include such a substantial rigidannular portion 28. - Although two
example fasteners 20 are illustrated and described herein, these examples are not intended to be limiting. For example, the illustratedfasteners 20 both include pairs ofretention wings 36, pairs ofslots 42, pairs ofgrooves 62, pairs ofretention pawls 44 and pairs ofinner retention teeth 46. Any combination of these features may alternatively be singularly represented in thefastener 20, while any other combination may be represented in pairs in the same or anotherfastener 20, and/or any of the combination may be represented in another multiple number in the same or another thefastener 20. For example, analternative fastener 20 could include asingle retention wing 36, threepawls 44, and only one of thepawls 44 including aninner retention tooth 46 - Although the terms first, second, third, etc. may be used herein to distinguish various elements, components, and/or portions from each other, they are not used herein to imply any relative importance, sequence or order. Similarly, although spatially relative terms, such as upper and lower, are used to describe various elements, components, and/or portions relative to each other when the fastener is oriented as shown in the drawing figures, they are not used herein to imply any particular required orientation of the fastener. Thus, the fastener may be otherwise oriented (rotated 90 degrees or at other orientations) and these spatially relative descriptors used herein interpreted accordingly.
- The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
Claims (14)
- An automotive fastener (20) for coupling a door trim panel (64) to an interior door member (40), the automotive fastener (20) comprising:a grommet (24) including:a grommet head (26), a barrel (32) extending from the grommet head (26), and a central aperture (34) extending axially through both the grommet head (26) and the barrel (32);at least one retention wing (36) extending radially outwardly from the barrel (32) and upwardly toward the grommet head (26);at least one barrel slot (42) separating a distal end of the barrel (32) into at least one pin retention pawl (44);wherein each pin retention pawl (44) includes an inner retention tooth (46) comprising a lead-in ramp surface (48) facing toward the grommet head (26) on an interior side of each pin retention pawl (44) and a lead-out ramp surface (50) distal of the lead-in ramp surface (48) and facing away from the grommet head (26);a pin (22) including:a pin head (52) and a shaft (54) extending axially from the pin head (52);wherein the shaft (54) comprises a recess (56) receiving the inner retention tooth (46), with a pin head facing surface (60) positioned and designed to engage the lead-out surface (50) and displace the pin retention pawl (44) radially outwardly during removal of the shaft (54) from the central aperture (34) of the grommet (24), and a distal-facing outer surface (58) positioned and designed to engage the lead-in surface (48) and displace the pin retention pawl (44) radially outwardly during insertion of the shaft (54) into the central aperture (34) of the grommet (24).
- The automotive fastener according to claim 1, wherein the at least one retention wing (36) comprises a pair of retention wings.
- The automotive fastener according to any of claims 1 or 2, further comprising at least one barrel groove (62) providing a thinned wall portion of the barrel extending from an upper end of the barrel slot (42).
- The automotive fastener according to claim 3, wherein the at least one barrel groove (62) extends longitudinally along the barrel (32).
- The automotive fastener according to any of claims 1 - 4, wherein the at least one barrel slot (42) extends longitudinally along the barrel (32).
- The automotive fastener according to any of claims 1 - 5, wherein the recess (56) of the shaft (54) receives the inner retention tooth (46) of each pin retention pawl (44) without radially outwardly displacing the pin retention pawls (44).
- The automotive fastener according to any of claims 1 - 6, wherein the grommet (24) comprises a molded plastic material that has stress properties that have not been modified by displacing the pin retention pawl (44) radially outwardly during insertion of the shaft (54) into the central aperture (34) of the grommet (24), although the pin (22) is positioned within the grommet (24) with the inner retention tooth (46) of the grommet (24) located within the recess (56) of the pin (22).
- The automotive fastener according to any of claims 1 - 7, wherein each retention wing (36) is positioned and designed to engage and retain a portion of the interior door member (40) between the grommet head (26) and the retention wings (36).
- The automotive fastener according to any of claims 1 - 8, wherein the grommet head (26) and the pin head (52) are positioned and designed to receive a portion of the door trim panel (64) therebetween with opposing sides of the portion of the door trim panel (64) engaging an underside of the pin head (52) and an upper side of the grommet head (26), respectively.
- The automotive fastener according to any of claims 1 - 9, wherein the pin (22) further comprises a second pin head (78), and the pin head (52) and the second pin head (78) are positioned and designed to receive a portion of the door trim panel (64) therebetween with opposing sides of the portion of the door trim panel (64) engaging an underside (70) of the pin head (52) and an upper side (80) of the second pin head (78), respectively.
- The automotive fastener according to any of claims 1 - 10, wherein the thinned walled portion is from about 15 percent to about 70 percent of an adjacent wall thickness of the barrel (32).
- The automotive fastener according to any of claims 1 - 11, wherein an angle of the lead-in ramp surface (48) relative to an axis of the barrel (32) is from about 115 degrees to about 65 degrees.
- The automotive fastener according to any of claims 1 - 12, wherein an angle of the lead-in ramp surface (48) relative to an axis of the barrel (32) is from about 100 degrees to about 80 degrees.
- A method of manufacturing the automotive fastener for coupling a door trim panel (64) to an interior door member (40) according to any of claims 1 - 13, wherein the method comprises:injecting pin molding material into a pin mold cavity having a shape corresponding to the pin to mold the pin (22);positioning the pin (22), molded in the pin mold cavity, within a grommet mold cavity having a shape corresponding to the grommet (24) when the pin (22) is positioned therein;injecting a grommet molding material into the grommet mold cavity around the pin (22) to mold the grommet (24);wherein the grommet molding material is different from the pin molding material and does not bond to the pin molding material when molding the grommet (24).
Applications Claiming Priority (1)
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US15/091,983 US9873388B2 (en) | 2016-04-06 | 2016-04-06 | Automotive door trim fastener and molding method |
Publications (2)
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EP3228504A1 true EP3228504A1 (en) | 2017-10-11 |
EP3228504B1 EP3228504B1 (en) | 2018-11-21 |
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EP17164681.3A Active EP3228504B1 (en) | 2016-04-06 | 2017-04-04 | Automotive door trim fastener and molding method |
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EP (1) | EP3228504B1 (en) |
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US10451100B2 (en) * | 2015-03-12 | 2019-10-22 | Illinois Tool Works Inc. | Reusable fastening clip assembly |
US10197089B2 (en) * | 2016-09-01 | 2019-02-05 | Nifco America Corp. | Clip and clip attaching structure |
USD824747S1 (en) * | 2016-09-30 | 2018-08-07 | Ged Integrated Solutions, Inc. | Window spacer frame locking member |
US10584727B2 (en) * | 2016-11-03 | 2020-03-10 | Ford Global Technologies, Llc | Multi-material restrainer joint |
US11054032B2 (en) * | 2018-01-11 | 2021-07-06 | Illinois Tool Works Inc. | Light weight hole plug |
US20200079297A1 (en) * | 2018-09-10 | 2020-03-12 | GM Global Technology Operations LLC | Self-alignment system for attaching a trim panel to a vehicle door assembly |
CN112081807A (en) * | 2019-06-14 | 2020-12-15 | 伊利诺斯工具制品有限公司 | Fastening piece |
CN114060374B (en) * | 2020-08-07 | 2023-10-03 | 光宝电子(广州)有限公司 | Fixing device |
CN115234554A (en) * | 2021-04-23 | 2022-10-25 | 伊利诺斯工具制品有限公司 | Fastening piece |
US11746812B2 (en) | 2021-05-12 | 2023-09-05 | Newfrey Llc | Dual component sealing fastener and coupling assembly including same |
WO2023219770A1 (en) * | 2022-05-13 | 2023-11-16 | Newfrey Llc | Serviceable stud and grommet assembly with low installation effort and high extraction force |
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Also Published As
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US20170291558A1 (en) | 2017-10-12 |
EP3228504B1 (en) | 2018-11-21 |
US9873388B2 (en) | 2018-01-23 |
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